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Evan Gatehouse[_2_] October 11th 07 08:14 AM

stainless steel foil instead of copper for grounding Ham radio?
 
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse

Lew Hodgett October 11th 07 09:43 AM

stainless steel foil instead of copper for grounding Ham radio?
 

"Evan Gatehouse" wrote in message
news:B3kPi.10444$th2.2814@pd7urf3no...
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio

setup?

No.

Lew



[email protected] October 11th 07 10:30 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 01:43:27 -0700, "Lew Hodgett"
wrote:


"Evan Gatehouse" wrote in message
news:B3kPi.10444$th2.2814@pd7urf3no...
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio

setup?

No.

Lew


Why not?


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Larry October 11th 07 01:38 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Evan Gatehouse wrote in
news:B3kPi.10444$th2.2814@pd7urf3no:

Could I use thin stainless steel foil instead of copper foil in

the
bilge as a ground for a long wire (backstay antenna) ham radio

setup?



Yep.

Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Martin Baxter October 11th 07 02:48 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Evan Gatehouse wrote:

Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse


You may get some electrolysis where your copper ground connects to the
foil, if you have any water in the bilge and it's saline you certainly
will. You'll probably end up with a fairly high resistance (bad)
connection in short order.

Cheers
Marty

Joe October 11th 07 03:13 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Oct 11, 2:14 am, Evan Gatehouse
wrote:
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse


Silver would work best. Stainless if alwful. A world leading antenna
designer says stainless loses HF attenuation faster then just about
any other metal as the signal follows the outside of the surface
unlike electricity, and the corrision(micro) coating on stainless is
the worst at conducting HF waves. He's running a silver wire thats
teflon coated mil spec stuff the length of my backstays. He said I
will have 3X's the ability of the typical SS backstay set-up. And BTW
tarnished silver is the best, even better than gold.

Joe


Steve Lusardi October 11th 07 08:42 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Evan,
I admit that I am not an expert in antenna theory, but the object of this
exercise is to establish a reflective ground plane for your long wire. The
obvious choice is the ocean. Why would anybody string anything inside the
hull? Not only would this wire be subject to corrosion due to electrolysis,
but this wire will always be less than optimum. What is wrong with an
insulated (from the hull) carbon block on the bottom of the boat with a
connecting stud for connection inside? This should deliver the required
connection without risk of corrosion.
Steve

"Evan Gatehouse" wrote in message
news:B3kPi.10444$th2.2814@pd7urf3no...
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the bilge
as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse




[email protected] October 12th 07 02:13 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 09:48:49 -0400, Martin Baxter
wrote:

Evan Gatehouse wrote:

Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse


You may get some electrolysis where your copper ground connects to the
foil, if you have any water in the bilge and it's saline you certainly
will. You'll probably end up with a fairly high resistance (bad)
connection in short order.

Cheers
Marty


Higher resistance then the connection to the stainless back stay?


Bruce in Bangkok
(brucepaigeATgmailDOTcom)

[email protected] October 12th 07 02:17 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 21:42:01 +0200, "Steve Lusardi"
wrote:

Evan,
I admit that I am not an expert in antenna theory, but the object of this
exercise is to establish a reflective ground plane for your long wire. The
obvious choice is the ocean. Why would anybody string anything inside the
hull? Not only would this wire be subject to corrosion due to electrolysis,
but this wire will always be less than optimum. What is wrong with an
insulated (from the hull) carbon block on the bottom of the boat with a
connecting stud for connection inside? This should deliver the required
connection without risk of corrosion.
Steve

"Evan Gatehouse" wrote in message
news:B3kPi.10444$th2.2814@pd7urf3no...
Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the bilge
as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse



I'm sure that Larry will comment on this but the foil inside the boat
forms a capacitance connection to the ocean, just outside the hull.

Many boats do have a "ground plate", a finned copper/bronze plate
bolted on the outside of the hull with connections made to one of the
mounting bolts inside the boat.

(The above assumes a fiberglass boat)

Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Brian Whatcott October 12th 07 03:25 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 07:14:41 GMT, Evan Gatehouse
wrote:

Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse


Yes but it's relatively high-resistance compared with copper, silver
plate, or (preferably soft) aluminum sheet.

Brian Whatcott Altus OK

Martin Baxter October 12th 07 02:51 PM

stainless steel foil instead of copper for grounding Ham radio?
 
wrote:

On Thu, 11 Oct 2007 09:48:49 -0400, Martin Baxter
wrote:

Evan Gatehouse wrote:

Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse


You may get some electrolysis where your copper ground connects to the
foil, if you have any water in the bilge and it's saline you certainly
will. You'll probably end up with a fairly high resistance (bad)
connection in short order.

Cheers
Marty


Higher resistance then the connection to the stainless back stay?


Only if your backstay spends long periods of time submerged, but then
you'll probably have other larger problems. ;-)

Cheers
Marty

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[email protected] October 12th 07 04:07 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Fri, 12 Oct 2007 09:51:03 -0400, Martin Baxter
wrote:

wrote:

On Thu, 11 Oct 2007 09:48:49 -0400, Martin Baxter
wrote:

Evan Gatehouse wrote:

Never seen this discussed befo

Could I use thin stainless steel foil instead of copper foil in the
bilge as a ground for a long wire (backstay antenna) ham radio setup?

Evan Gatehouse

You may get some electrolysis where your copper ground connects to the
foil, if you have any water in the bilge and it's saline you certainly
will. You'll probably end up with a fairly high resistance (bad)
connection in short order.

Cheers
Marty


Higher resistance then the connection to the stainless back stay?


Only if your backstay spends long periods of time submerged, but then
you'll probably have other larger problems. ;-)

Cheers
Marty

------------ And now a word from our sponsor ----------------------
For a quality mail server, try SurgeMail, easy to install,
fast, efficient and reliable. Run a million users on a standard
PC running NT or Unix without running out of power, use the best!
---- See http://netwinsite.com/sponsor/sponsor_surgemail.htm ----


To obtain capacitance coupling to the ocean the plate has only to be
below the external water line and I have not seen too many boats with
bilge water that high.

Further if the plate is only acting as the ground plane in an antenna
system then to avoid electrolyses the RF ground should be connected to
the plate through high voltage capacitors thus no DC current on the
plate.

If connections are made with proper tin plated wire and terminals
there is no reason that corrosion should be any more a problem then
with any other electrical systems mounted below the cabin sole.



Bruce in Bangkok
(brucepaigeATgmailDOTcom)

Bruce in Alaska[_2_] October 12th 07 06:53 PM

stainless steel foil instead of copper for grounding Ham radio?
 
In article ,
wrote:

To obtain capacitance coupling to the ocean the plate has only to be
below the external water line and I have not seen too many boats with
bilge water that high.

Further if the plate is only acting as the ground plane in an antenna
system then to avoid electrolyses the RF ground should be connected to
the plate through high voltage capacitors thus no DC current on the
plate.

If connections are made with proper tin plated wire and terminals
there is no reason that corrosion should be any more a problem then
with any other electrical systems mounted below the cabin sole.



Bruce in Bangkok
(brucepaigeATgmailDOTcom)


If the "Plate" is to used to be one side of a Capacative Coupling
for the RF Grounding of an MF/HF Antenna System, then your "Best
Solution" is to use a material with the Lowest Resistance, Highest
Surface Area, encase it in the Thinest Dielectric Insulating
Film available, and mount it as close as possible to the SeaWater.
No High Voltage Capacitor, required, as the Dielectric Film will
be the DC Current Insulator.

Bruce in alaska
--
add path before @

Larry October 13th 07 02:48 AM

stainless steel foil instead of copper for grounding Ham radio?
 
Bruce in Alaska wrote in news:fast-
:

If the "Plate" is to used to be one side of a Capacative

Coupling
for the RF Grounding of an MF/HF Antenna System, then your

"Best
Solution" is to use a material with the Lowest Resistance,

Highest
Surface Area, encase it in the Thinest Dielectric Insulating
Film available, and mount it as close as possible to the

SeaWater.
No High Voltage Capacitor, required, as the Dielectric Film

will
be the DC Current Insulator.



Next time you're at sea and bored to tears, connect 100' of
plastic covered wire to the ground post on your tuner, sealed up
on the open end, if you like. The plastic is the "thin
dielectric film" in Bruce's eloquent description. It keeps the
water from eating the wire. Toss it overboard and let it trail
out in the ocean behind the boat, but DON'T FORGET TO REEL IT IN
BEFORE YOU ENTER HARBOR!

There, now you have a great "ocean RF ground" without rummaging
around down in the bilgewater and rats.

Try it before and after with someone at a distance you know and
see how much difference he sees in your signal "out there". It
makes about 5 S-units on Lionheart. Works great, cheap, easy to
deploy and retrieve, not to mention fun.

Oh, before I stop, I wanna mention:

DON'T PUT ANY SHINY CAN TOP AS A DRAG CHUTE LITTLE SEA ANCHOR TO
HOLD IT OUT TIGHT! "Something BIG!" ate my cat food tin can! It
also ate about 35' off the end of my wire! Musta been a WHOPPER!

"They", whoever "they" are, can't grab just the open-ended wire.

Larry
--
Maybe "they" were attracted to my melodious LSB on 75 meters!

Richard Casady October 13th 07 12:26 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sat, 13 Oct 2007 01:48:48 +0000, Larry wrote:

DON'T PUT ANY SHINY CAN TOP AS A DRAG CHUTE LITTLE SEA ANCHOR TO
HOLD IT OUT TIGHT! "Something BIG!" ate my cat food tin can! It
also ate about 35' off the end of my wire! Musta been a WHOPPER!

"They", whoever "they" are, can't grab just the open-ended wire.


Ships used to dangle a long line with a spinner on the end from the
stern of a boat or ship. It was attached to a mechanical counter. This
was called a taffrail log. [The one you threw was a chip log.]
Sometimes fish would disappear the spinner. I am surprised how seldom
it seems to have happened.

Casady

Richard Casady October 13th 07 01:27 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 07:13:46 -0700, Joe
wrote:

And BTW
tarnished silver is the best, even better than gold.


The tarnish doesn't do anything good. On a relative scale, silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that is
worth. Better at one is generally better at the other.

Casady

Joe October 13th 07 07:43 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Oct 13, 7:27 am, (Richard Casady)
wrote:
On Thu, 11 Oct 2007 07:13:46 -0700, Joe
wrote:

And BTW
tarnished silver is the best, even better than gold.


The tarnish doesn't do anything good. On a relative scale, silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that is
worth. Better at one is generally better at the other.

Casady


Richard...I'm telling you one of the worlds top antenna designers
lives here and I just happened to be lucky enough to get his help
setting up my radios. If he tells me tarnished silver is the best for
HF I take his word for it..If our goverment flys him all over the
earth to design develope and set up the best....that's good enough
reference for me.

Joe


Brian Whatcott October 14th 07 12:12 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sat, 13 Oct 2007 12:27:03 GMT, (Richard
Casady) wrote:

On Thu, 11 Oct 2007 07:13:46 -0700, Joe
wrote:

And BTW
tarnished silver is the best, even better than gold.


The tarnish doesn't do anything good. On a relative scale, silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that is
worth. Better at one is generally better at the other.

Casady



I have silver at 0.0159 microhm meter at 20 degC
copper 0.0168 microhm.meter
gold 0.022 microhm meter

So gold may not be not quite as conductive as the best, but it STAYS
at that value - no tarnish....

Brian W

Larry October 14th 07 02:27 AM

stainless steel foil instead of copper for grounding Ham radio?
 
(Richard Casady) wrote in
:

Sometimes fish would disappear the spinner. I am surprised how

seldom
it seems to have happened.



I wonder if it were bigger than my catfood can. That might
explain the fewer hits. Someone aboard said, "Hey! Your wire
hit the bottom!", but I pointed out the DEPTH read 325' and my
wire was only 100' long....physics?

I didn't see it happen, just the aftermath...shortened wire. He
must have swallowed the can, leading to some fish cleaner
standing on the fish line at some packing plant to scratch her
head....(c; She'd wonder about my nice bridle I made to hold the
can for max drag.

I used the wire many times after that just like it was. Didn't
seem to make any difference. It's still a great ground plane to
work the tuner against.

My captain gets nervous when I talk on 20 meters and all the
lights in the panel modulate with my voice. It's only 150
watts....(c;


Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Larry October 14th 07 02:31 AM

stainless steel foil instead of copper for grounding Ham radio?
 
(Richard Casady) wrote in
:

And BTW
tarnished silver is the best, even better than gold.


The tarnish doesn't do anything good. On a relative scale,

silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is

about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that

is
worth. Better at one is generally better at the other.

Casady



You boys worry about this WAY too much. Take a little reality
trip down to your favorite AM radio station and ask the engineer
if he'll show you the ground system at the base of one of the
towers. Don't touch the tower. It has kilowatts on it and the
arc will burn you. Notice how the bridge cables that have been
buried for 40 years look a little "tarnished" where you can see
'em. Half of 'em underground are just copper sulphate by now...
(c;

Your "tarnished" silver-plated ground strap is fine....mine, too.



Larry W4CSC and other fine old calls since 1957
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Larry October 14th 07 02:39 AM

stainless steel foil instead of copper for grounding Ham radio?
 
Brian Whatcott wrote in
:

I have silver at 0.0159 microhm meter at 20 degC
copper 0.0168 microhm.meter
gold 0.022 microhm meter

So gold may not be not quite as conductive as the best, but it

STAYS
at that value - no tarnish....

Brian W



I wish you guys would worry much more about "series inductance"
and lots less about how expensive you can make the damned ground
strap.

Look at your ground strap and follow it down to whatever is
supposed to be "ground" on your boat.

1 - Are there any sharp corners or folds back over itself to make
it look really neat, like boaters love their stuff?

This is bad, very bad. Every sharp curve increases the series
inductance, and inductive reactance. If it bends 90 degrees, you
have a 1/4 turn coil in series, raising the ground at the tuner
MUCH more than the total combined resistance of all the metal
chemistry in the circuit, which increases with frequency.

All turns in the ground strap should be as large a diameter as
you can make it and very smooth to reduce series inductance. It
should be routed in as straight a line from the tuner to the
ground as you can make it, for this same reason. This strap is
PART of the antenna. It radiates like mad when you're on the
air, into the bilge wiring, the reason why the LEDs in the DC
panel all light up when you talk. They're detecting the RF
induced into those DC cables in the bilge.

Now, let's put away the periodic tables and go reroute the ground
straps, taking off all the pretty tywraps and making them as
straight as possible, shortening them as much as we can.

Larry W4CSC and other fine old calls since 1957
--
Bruce will be by to inspect your installation, shortly.

Brian Whatcott October 14th 07 03:28 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sun, 14 Oct 2007 01:39:43 +0000, Larry wrote:


I wish you guys would worry much more about "series inductance"
and lots less about how expensive you can make the damned ground
strap.

....
Larry W4CSC and other fine old calls since 1957



A valid point. But then, running an insulated wire underwater
has rather appreciable series inductance too
(which can self-tune at some frequency -
I wonder what fx that is? :-)

Brian W

Joe October 14th 07 03:45 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Oct 13, 8:39 pm, Larry wrote:
Brian Whatcott wrote :



I have silver at 0.0159 microhm meter at 20 degC
copper 0.0168 microhm.meter
gold 0.022 microhm meter


So gold may not be not quite as conductive as the best, but it

STAYS
at that value - no tarnish....


Brian W


I wish you guys would worry much more about "series inductance"
and lots less about how expensive you can make the damned ground
strap.

Look at your ground strap and follow it down to whatever is
supposed to be "ground" on your boat.

1 - Are there any sharp corners or folds back over itself to make
it look really neat, like boaters love their stuff?

This is bad, very bad. Every sharp curve increases the series
inductance, and inductive reactance. If it bends 90 degrees, you
have a 1/4 turn coil in series, raising the ground at the tuner
MUCH more than the total combined resistance of all the metal
chemistry in the circuit, which increases with frequency.

All turns in the ground strap should be as large a diameter as
you can make it and very smooth to reduce series inductance. It
should be routed in as straight a line from the tuner to the
ground as you can make it, for this same reason. This strap is
PART of the antenna. It radiates like mad when you're on the
air, into the bilge wiring, the reason why the LEDs in the DC
panel all light up when you talk. They're detecting the RF
induced into those DC cables in the bilge.

Now, let's put away the periodic tables and go reroute the ground
straps, taking off all the pretty tywraps and making them as
straight as possible, shortening them as much as we can.

Larry W4CSC and other fine old calls since 1957
--
Bruce will be by to inspect your installation, shortly.


Get a steel hull and just run a short wire to the hull. :o)

Grounding straps are for kids.

Joe


Bruce in Alaska[_2_] October 14th 07 06:17 PM

stainless steel foil instead of copper for grounding Ham radio?
 
In article .com,
Joe wrote:

Richard...I'm telling you one of the worlds top antenna designers
lives here and I just happened to be lucky enough to get his help
setting up my radios. If he tells me tarnished silver is the best for
HF I take his word for it..If our goverment flys him all over the
earth to design develope and set up the best....that's good enough
reference for me.

Joe


Your Designer Friend is certainly speaking from experience. The
Experience of a Job that has little monitary consideration. The rest of
the non-commercial boaters of the world may not need the "Money is no
Object" design, where the difference between Tarnished Silver, and
plain old Copper Foil, could possibly be significant, to the RF Ground
for their MF/HF Antenna System. Larry's observation that the Series
Impedance of the RF Ground, is considerably MORE significant, than the
Resistance difference, between Tanished silver and Copper Foil, in
the Total RF Ground Impedance of the Antenna System.

Bruce in alaska who has designed and installed RF Ground Systems
for LF/MF/HF Radio Stations on Land and at Sea
for the last 40 Years.... and inspected them
for Regulatory Agencies, in the past.....
--
add path before @

Richard Casady October 14th 07 06:35 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sun, 14 Oct 2007 01:31:49 +0000, Larry wrote:

Your "tarnished" silver-plated ground strap is fine....mine, too.


It is well known that copper is somewhat soluble in sea water. After
all it was used to cover ships bottoms to retard marine growth. Had to
be in solution to be toxic. Silver is not very subject to attack. They
use it for medical work: I have silver wire in my jaw.
So, silver may well outlast copper in the ground. Life of either
should be long enough, in any case. They often ground electrical
transformers with a six foot or so copper rod driven into the ground
at the base of the pole. Fairly heavy conducters running down the
poles. I wonder if people steal them. They do get killed trying to
steal energized wire. You are supposed to ground your end of the
neutral, but whatever.

Casady

Larry October 14th 07 10:33 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Brian Whatcott wrote in
:

which can self-tune at some frequency


The only reason the boat has a tuner is we can't make an antenna
"self tune" but on a couple of frequencies.

All my ham antennas at home are "self tuning". No tuner is
required or wanted as they are so lossy.



Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Larry October 14th 07 10:35 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Joe wrote in
oups.com:

Get a steel hull and just run a short wire to the hull. :o)


You guys should see how well a Butternut HF9VX vertical ham antenna
works clamped to the handrail of the flight deck of the USS
Yorktown (CV-10) in Charleston Harbor....one of the "World's
Largest Ground Planes".

Her call is WA4USN, thanks to Senator Thurmond. The base of the
antenna is about 80' off the harbor surface.

Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Richard Casady October 14th 07 11:17 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Thu, 11 Oct 2007 21:25:14 -0500, Brian Whatcott
wrote:

Yes but it's relatively high-resistance compared with copper, silver
plate, or (preferably soft) aluminum sheet.


Funny you should mention soft. It is true that anything that hardens
copper or aluminum will increase electrical resistance. In the case of
work hardening, you beat dislocations into the crystal structure. Even
that has a very slight effect on the electrical properties. If you
have a joint between copper and aluminum immersed in the bilge water,
you may perhaps have some trouble with corrosion.

Casady

Richard Casady October 14th 07 11:30 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sun, 14 Oct 2007 17:17:34 GMT, Bruce in Alaska
wrote:

Impedance of the RF Ground, is considerably MORE significant, than the
Resistance difference, between Tanished silver and Copper Foil, in
the Total RF Ground Impedance of the Antenna System.


No trouble believing that. Note that silver has ninety percent of the
electrical resistance, other things being equal. Thing is, there is no
reason why things should be equal. Make the copper foil ten percent
thicker and it will have the same resistance. I think a wide strap for
a conductor, to reduce inductance, would be helpful, but I don't
really know.

Casady

Richard Casady October 14th 07 11:48 PM

stainless steel foil instead of copper for grounding Ham radio?
 
On Sun, 14 Oct 2007 21:35:49 +0000, Larry wrote:
[Yorktown, CV-10]
about 80' off the harbor surface.


I guess people fall off of carriers and sometimes survive. Eighty feet
is a long drop. Good chance they won't find you, if it is moving. At
night, forget it.
Casady


Larry October 15th 07 12:08 AM

stainless steel foil instead of copper for grounding Ham radio?
 
(Richard Casady) wrote in
:

I guess people fall off of carriers and sometimes survive.

Eighty feet
is a long drop. Good chance they won't find you, if it is

moving. At
night, forget it.
Casady


One night, right after Yorktown came to Patriot's Point Naval
Museum's dock, a brisk breeze came up from the north, pushing
Yorktown away from her dock and big mooring pilings.

The lines snapped and Yorktown headed back out to sea floating
free off towards the port and passenger docks on the downtown
Charleston peninsula. The only man aboard was the astonished
security rent-a-cop screaming for help on his cellphone, all
alone on the monster. By the time the Navy tugboats got haulin'
ass downriver to take control of the derelict, she was almost
aground on Shute's Folly, a tiny island in the harbor. That
would have been bad. Navy tugs got her under power and put her
back at anchor at Patriot's Point. They couldn't dock her as her
dock was totally destroyed, hanging under her starboard side,
mostly.

To prevent this in the future, it was decided to SINK Yorktown,
permanently by pumping millions of gallons of fresh water into
her bilge compartments to put her on the pluff mud, then seal
those flooded compartments in wax to prevent it smelling. She
was then pumped all the way around with sand from a dredge to
insure her stability....well, at least into the far future when
the whole bottom will be rotted off her, creating someone ELSE's
Yorktown problem for the next generation...(c;



Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Larry October 15th 07 12:09 AM

stainless steel foil instead of copper for grounding Ham radio?
 
(Richard Casady) wrote in
:

I guess people fall off of carriers and sometimes survive. Eighty

feet
is a long drop. Good chance they won't find you, if it is moving.

At
night, forget it.
Casady


Sunk in sand like my last post shows, if you fall over the side,
you'll be falling into water that's a foot deep at low tide.
You'll die, instantly.

Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Red October 16th 07 05:53 AM

stainless steel foil instead of copper for grounding Ham radio?
 
The tarnish doesn't do anything good. On a relative scale, silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that is
worth. Better at one is generally better at the other.

Casady



Richard...I'm telling you one of the worlds top antenna designers
lives here and I just happened to be lucky enough to get his help
setting up my radios. If he tells me tarnished silver is the best for
HF I take his word for it..If our goverment flys him all over the
earth to design develope and set up the best....that's good enough
reference for me.

Joe


I bet Larry could tell a few interesting stories on this subject.
Antenna designers are really in a world of their own. Back in the day I
remember a group of antenna engineers that were hired to keep a large
surveillence receiver antenna working. They would come down and crawl
inside the antenna case with a small metal tackle box. After a short
while you would hear some light banging here and there and then they
would come out and test it. The tackle box they carried had several
hammers in it they used to shape/tune the antenna with. In conversation
with them and from reading on the subject I learned that when it comes
to antenna design some of what you think should make sense, actually
doesn't. And sometimes stuff just works when intuitively you would think
it wouldn't.
Red

Larry October 16th 07 03:05 PM

stainless steel foil instead of copper for grounding Ham radio?
 
Red wrote in news:%sXQi.1096$932.869
@newsfe12.lga:

Richard...I'm telling you one of the worlds top antenna

designers
lives here and I just happened to be lucky enough to get his

help
setting up my radios. If he tells me tarnished silver is the

best for
HF I take his word for it..If our goverment flys him all over

the
earth to design develope and set up the best....that's good

enough
reference for me.

Joe


I bet Larry could tell a few interesting stories on this

subject.
Antenna designers are really in a world of their own. Back in

the day I
remember a group of antenna engineers that were hired to keep a

large
surveillence receiver antenna working. They would come down and

crawl
inside the antenna case with a small metal tackle box. After a

short
while you would hear some light banging here and there and then

they
would come out and test it. The tackle box they carried had

several
hammers in it they used to shape/tune the antenna with. In

conversation
with them and from reading on the subject I learned that when

it comes
to antenna design some of what you think should make sense,

actually
doesn't. And sometimes stuff just works when intuitively you

would think
it wouldn't.
Red



We COULD turn your 55' mainmast into a conical monopole, like the
gummit uses on HF, but the cage might interfere with the genoa...
(c;

About the banging, one of my technical college associates was the
wife of Dr Rufus Fellars, Chair of the Electrical Engineering
school at the Univ of SC in Columbia. One of the UHF TV stations
in Columbia had a bad reflected power from their multimillion
dollar antenna system 1200' up. They hired Rufus to correct it.
He took the measurements, did some calculations and drew up plans
to put 3 dents in the UHF feedline, creating another reflection
to cancel the one they had. Machinists installed the dents, and
when the station was turned back on, it had no reflected power
one could measure, making their big multikilowatt UHF beast very
happy, indeed.

Denting works at microwaves much better than HF, however. Dents
at HF frequencies are measured in hundreds of feet, not inches.

HF on a boat has but two antennas...a flagpole....a clothesline.
Neither antenna is "resonant" at the frequencies you want to use
them. So, we must always compromise by having a very lossy L-C
tuner in the line to match the complex impedance of the
clothesline, with its highly reactive component creating that big
reflection, to the 52 ohm resistive-only transmitter. This is,
virtually, a variable dent you can slide up and down the line
that also varies in depth and width to match the wide variety of
frequencies Marine HF has spread across. You are using the same
antenna system the Morse operator on Titanic used with his spark
gap CW transmitter, feeding a tuner to untuned wires between her
masts. If you look at qrz dot com and put in my call W4CSC into
the search engine, you'll see a picture of me holding a 300,000
volt ceramic insulator that failed around 70 KW on a pirate radio
ship I had befriended the captain and chief engineer of. The
tuner was built into the top of the military HF transmitter:
http://hawkins.pair.com/voanc1.shtml
It came from Voice of America in Greenville, NC, bought surplus:
http://hawkins.pair.com/voanc/voanc07.jpg
This transmitter was built into the fish hold of an old Canadian
offshore fishing trawler and installed at one of our little
shipyards for Rev R G Stair, who talks directly to his God and
rapes the women living on his commune in Canadys, SC. The boat
was supposed to be taken to Belize where he'd bribed the right
people to let him anchor offshore in international waters
microwaving his religious nonsense out to the boat for HF
transmission on the shortwave bands. But, the captain, a non-
religious man living in St Kitts to avoid American prosecution
about a pirate 100KW FM station they used to run from a sailboat
off NYC, was afraid the "brothers" were going to feed him to the
fish as soon as he got the boat in place and working. So, to
attract the FCC's wrath and prevent the boat from moving, he
transmitted on the pirate's favorite frequencies just above 7.3
Mhz in the 41 meter band at 70KW from the Wando River here. It
worked. FCC swooped down and confiscated everything making a big
show in the paper of what great bureaucrats they are at
protecting the airwaves of the rich and powerful, like Clear
Channel Commications, Inc. to keep the airwaves for themselves.

That insulator sure made an impressive arc when it exploded...(c;

Larry
--
You can tell there's extremely
intelligent life in the universe
because they have never called Earth.

Terry K October 17th 07 04:51 AM

stainless steel foil instead of copper for grounding Ham radio?
 
On Oct 16, 1:53 am, Red wrote:
The tarnish doesn't do anything good. On a relative scale, silver is
250, copper 225, as is gold. Aluminum is 175. Stainless is about like
lead, 6 or 8. Plain carbon steel is 25. Thermal conductivity is
closely correlated with electrical conductativity for what that is
worth. Better at one is generally better at the other.

Casady


Richard...I'm telling you one of the worlds top antenna designers
lives here and I just happened to be lucky enough to get his help
setting up my radios. If he tells me tarnished silver is the best for
HF I take his word for it..If our goverment flys him all over the
earth to design develope and set up the best....that's good enough
reference for me.

Joe


I bet Larry could tell a few interesting stories on this subject.
Antenna designers are really in a world of their own. Back in the day I
remember a group of antenna engineers that were hired to keep a large
surveillence receiver antenna working. They would come down and crawl
inside the antenna case with a small metal tackle box. After a short
while you would hear some light banging here and there and then they
would come out and test it. The tackle box they carried had several
hammers in it they used to shape/tune the antenna with. In conversation
with them and from reading on the subject I learned that when it comes
to antenna design some of what you think should make sense, actually
doesn't. And sometimes stuff just works when intuitively you would think
it wouldn't.
Red


Some of those hammers were used to bend fins in the waveguide cavities
no doubt. The claws were employed to bend mechanically activated
tuning tabs here and there. Been there, done that, sold the t-shirts,
spent the money on drugs like caffeine, carbohydrates, etc. Didn't
like it, not going back next tour. Too uncertain. Too dusty.

ACTPSF (Always check the power supply first) is the eleventh
technicians' commandment. I hope that is ambiguous enough for you.

When the feet rot out of this world's biggest ground plane ask
yourself why it wouldn't matter, and why it would. Nebacudnezer might
know.

Antennae, like anything electrical, are bifilar devices. The power
"ground" line is part of the antenna if you have a monopole antenna (a
nonconfabulation, or oxymoron). Local static is equally expressible as
noise in the transmitter as it is in the receiver. The resistance of
the "ground" is connected to the end of the ground lead in the power
supply, but the resistor isn't connected to anything in common between
the tx and the rx, except for the distance. The distance between the
two non connections is related to the frequency and the distance and
the propogation path and the orientation (or call it the polarization)
between the two fields in the "ether well" or gravitational effects
field, as far as the coupling fields are concerned. Who doesn't
understand that? "Ground" is irrelevant, as it does not exist at radio
(wireless) distances, but only in local fields, where you have test
equipment with one lead marked "ground", for idiots.

Terry K -the eleventh technician, who revels in 16 channel data scopes
and differential glitches inside the discrete processor core with
75,000 test points, caused by old drum memory bearing wobble, known as
"RIMP", for NuDet reporting, long obsolete in NORAD, an early, buggy,
phone booth sized workstation connected to arpanet's daddy, defnet,
only they didn't tell us that was what "they" called it around the
water cooler, while we sat, bomb bait in our fallout shelter
"careers". Aargh! I feel as if I wasted my life!

Distillation will not remove radioactivity. MAD is our only hope,
aside from habeus corpus. Thank God for the crazy Americans.

I have no other credentials except my music, which I still cannot
transmit on the internet, because weener dozer won't sell me data
upload wads at near cost, nor you.

Damn! I am getting to hate computers. The last time I plugged a real
modem into my computer, the winmodem driver burned out my motherboard
centronics printer port. Argh! Phoner25.zip doesn't work on widoze
2000 any more! CRAP!

Jump ship! Copy LINUX for free, manuals extra. Write your own drivers.

What freedom? I just bought my mortgage as an investment in my SDRRSP,
now must pay the bank to supervise foreclosure on myself if I don't
pay the debt to myself, so I must pay myself interest, and income tax
on the income. Why can I not simply forgive myself the debt?



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